1999 Chevy Suburban Check Engine Light Comes on above 60 mp

KABBOTT

MEMBER
1999 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
95,000 MILES

We drive the Suburban around town most of the time and have no problems with the Check Engine light coming on. However, when we go on the interstate and get it above 60 mph (this tends to happen when we are going up a hill), it shutters a bit and then the Check Engine light comes on flashing. Once we slow down it stops flashing and then we can go up to about 65 mph before it starts flashing again. After we get to our destination and turn it off, it usually takes another time of starting it up and driving it before the Check Engine light goes off. It will stay off again until we take it out on the interstate and get it above 60 again. We have tried to crank the gas cap down thinking that was the problem, but it doesn't seem to help. Since we don't get above 60 mph but 1 or 2 times a month, this hasn't been a problem, but I want to make sure we are not hurting the engine by not having it checked out.

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

To find out what's causing the light to come On get the computer scanned for code/s this is your starting point.

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Friday, November 27th, 2009 AT 3:41 AM

KABBOTT

MEMBER
2 POSTS

Thanks rasmataz! I will find some place that will scan the code for me and reply back with the codes. The engine light has gone off since it happened yesterday, so I will take it back out on the interstate to get the engine light to come back on again and then take it to get it scanned right away.